adventurers in another plane considered as outsiders?

[Ironballs]

specifically,
the group of adventurers went to Hell, and encountered a Bearded devil who uses the spell 'Unholy blight' against them.
the spell should cause more damage to Outsiders - now since the adventurer our not in their native plane, do I treat them as outsiders for the spell purpose?

[DonDuckie]

They are not outsiders, but they do gain the extraplanar subtype.

[Claxon]

They are outsiders in the metaphysical sense. But the Duck is right.

Quote:

Extraplanar Subtype: This subtype is applied to any creature when it is on a plane other than its native plane. A creature that travels the planes can gain or lose this subtype as it goes from plane to plane. Monster entries assume that encounters with creatures take place on the Material Plane, and every creature whose native plane is not the Material Plane has the extraplanar subtype (but would not have it when on its home plane). Every extraplanar creature in this book has a home plane mentioned in its description. Creatures not labeled as extraplanar are natives of the Material Plane, and they gain the extraplanar subtype if they leave the Material Plane. No creature has the extraplanar subtype when it is on a transitive plane, such as the Astral Plane, the Ethereal Plane, or the Plane of Shadow.

[Kazaan]

The thing about Outsiders is that they function, spiritually, differently from beings of the Material Plane. Denizens of the Material Plane have body/soul duality; when the body dies, the soul is "released". In the case of Outsiders, body and soul are the same unit and when they "die", their body/soul unit will "dissolve" back into the "background noise" of their plane. An Outsider that goes to another plane gets the Extraplanar subtype, but an Outsider on their home plane trades Extraplanar for Native subtype. But "mortals" still function differently, whether they are lowly animals or vermin or great Dragons, they still have physical body/intangible soul duality. Given that, attacks that deal more damage to Outsiders are, in fact, relying on that lack of duality to affect their soul directly when they strike the body and that won't work against a Humanoid, Animal, or even a Dragon just because they're traveling off-plane, unless they've become an Outsider through some extraordinary or supernatural means, essentially fusing their soul to their tangible body.